/*  mbed Microcontroller Library
    Copyright (c) 2006-2013 ARM Limited

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/
#include "FileSystemLike.h"

namespace mbed {

    class BaseDirHandle : public DirHandle {
      public:
        /*
            We keep track of our current location as the n'th object in the
            FileSystemLike list. Using a Base* instead would cause problems if that
            object were to be destroyed between readdirs.
            Using this method does mean though that destroying/creating objects can
            give unusual results from readdir.
        */
        off_t n;
        struct dirent cur_entry;

        BaseDirHandle() : n(0), cur_entry() {
        }

        virtual int closedir() {
            delete this;
            return 0;
        }

        virtual struct dirent* readdir() {
            FileBase* ptr = FileBase::get(n);
            if (ptr == NULL) {
                return NULL;
            }

            /* Increment n, so next readdir gets the next item */
            n++;

            /* Setup cur entry and return a pointer to it */
            std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
            return &cur_entry;
        }

        virtual off_t telldir() {
            return n;
        }

        virtual void seekdir(off_t offset) {
            n = offset;
        }

        virtual void rewinddir() {
            n = 0;
        }
    };

    FileSystemLike::FileSystemLike(const char* name) : FileBase(name, FileSystemPathType) {

    }

    FileSystemLike::~FileSystemLike() {

    }

    DirHandle* FileSystemLike::opendir() {
        return new BaseDirHandle();
    }

} // namespace mbed
